This activity sensor works with the ‘Beurer HealthCoach’ app. After the device is set up, it continuously records your physical activity and converts this activity into steps. Actual distance covered may differ from calculated values. Do not use while swimming or while in the shower. This device is splash-proof, not waterproof. To sync with your mobile device, press and hold the power button for five seconds. Now get active! Charge the device fully before using. To charge, connect the USB charging cable to the device and to a powered USB port. Charging time is about three hours. To transfer data to your mobile device, press and hold the power button for five seconds in all modes except ‘SLEEP’ mode. To access Sleep Mode, press the power button repeatedly until ‘SLEEP’ appears on the LCD Display. Press and hold the power button for three seconds to activate or deactivate, as applicable.